STUDY OF SUPERLUMINAL-PULSE PROPAGATION IN ONE-DIMENSIONAL PHOTONIC CRYSTALS BY THE FDTD METHOD

摘要

We study the pulse propagation in a one-dimensional photonic crystal using the finite-difference time-domain method. The wave propagation inside the crystal is the result of superposition of forward and backward waves. We observed the superluminal phenomena and negative values of the velocity of the energy-density maximum. The energy velocities within the crystal never exceed the speed of light in vacuum. We hope that our study contributes to a further understanding of the superluminal phenomena.